dart – Flutter Error：当前的Flutter SDK版本是2.1.0-dev.0.0.

The current Dart SDK version is 2.1.0-dev.0.0.flutter-be6309690f.

Because buddy depends on flutter_built_redux 0.4.5 which requires SDK 
version >=1.19.0 <2.0.0,version solving failed.                                                  
pub get failed (1)

如何降级Dart或如何解决此问题,我在mac上运行android studio.

我试过通过改变颤动的通道开发和主人,但它并没有什么区别.

扑医生-v结果：

[?] Flutter (Channel dev,v0.6.0,on Mac OS X 10.13.4 17E202,locale en-IN)
? Flutter version 0.6.0 at /Users/pro/Downloads/flutter
? Framework revision 9299c02cf7 (5 days ago),2018-08-16 00:35:12 +0200
? Engine revision e3687f70c7
? Dart version 2.1.0-dev.0.0.flutter-be6309690f

[?] Android toolchain - develop for Android devices (Android SDK 27.0.3)
  ? Android SDK at /Users/pro/Library/Android/sdk
  ? Android NDK location not configured (optional; useful for native 
     profiling support)
  ? Platform android-27,build-tools 27.0.3
  ? Java binary at: /Applications/Android 
     Studio.app/Contents/jre/jdk/Contents/Home/bin/java
  ? Java version OpenJDK Runtime Environment (build 1.8.0_152-release- 
     1024-b01)
? All Android licenses accepted.

[?] iOS toolchain - develop for iOS devices (Xcode 9.4.1)
? Xcode at /Applications/Xcode.app/Contents/Developer
? Xcode 9.4.1,Build version 9F2000
? ios-deploy 1.9.2
? CocoaPods version 1.5.0

[?] Android Studio (version 3.1)
? Android Studio at /Applications/Android Studio.app/Contents
? Flutter plugin version 27.1.1
? Dart plugin version 173.4700
? Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

[!] Connected devices
! No devices available